2. Strategy and Deck Building

Blood-Queen Lana'thel is a straightforward boss with one important mechanic
to be aware of. At the start of the fight, the boss will have a copy of
Bite of the Blood-Queen added to their hand and will be used to give you
the Vampiric Bite Hero Power. The Hero Power gives a minion +2/+2 and
turns them into a vampire, making them immune to future casts of the spell.
The Hero Power must be used each turn even if the target is an enemy minion.
Any effect that blocks Hero Powers does not stop this effect and if you change
your Hero Power with a card like Vilefin Inquisitor the boss will
have another copy of Bite of the Blood-Queen added to their hand that they
will immediately use again.

The strategy of this fight is to play a constant flow of minions to take
advantage of the Vampiric Bite Hero Power; using cards that summon
multiple minions either through Battlecry or Deathrattle effects is
particularly useful for this situation. If you are consistently able to target
friendly minions with the Vampiric Bite Hero Power, then the resulting value
and tempo is enough to win the game no matter your strategy. It is important
to keep aware that the boss uses 2 copies of Blood Essence, which will
lower the number of minions you have in hand and potentially force you to buff
an enemy minion. The boss starts with two copies of Sleeping Acolyte on
the board, these minions do very little during the fight and only exist to
create a powerful target for Vampiric Bite that you should avoid at all
costs.